Electric lamp



March l2, .1940. K. P. swANsoN ELECTRIO LAMP Filed May 1'?.l 1938isatented Mar. 12,v 1940 UNITED STATES n ELECTRIC Kenneth P. Swanson,Rockport, Mass., assigner,

by menne assignments, to Birdseye Electric Corporation, Gloucester,Masa, a. corporation of Massachusetts Application May 11, 193s, serialNo. 208,412

12 Claims.

The present invention relates to electric in candescent lamps andconsists in an improved filament supporting structure lfor use in lampsof high wattage, .more particularly in those in which the iilament ispositioned at a considerable distance from the base. In lamps of thistype one serious cause of deterioration has been found to be relativemovement or vibration of the lead or supporting wires which causesbreaking of the filament. Furthermore, the usual practice has been toseal the lead and supporting wires into t' the press, and it oftenhappens that vvibration of the structure above the press causes the'stemrelative vibration thereof and also to provide means outside the pressand'the stem of the mount but cooperating therewith to anchor the leadand supporting wires and relieve the press and the mount from harmfulstress.

' An important feature of the invention as herein shown resides in thenovel structure used for holding the filament in position at the ends ofthe supporting wires, a, structure which is particularly advantageouswhen used in combination a with coiled or coiled coil laments anddesigned Aline 6 6 of Fig. 5.

to allow expansion and contraction of the ilament without undue stressthereon.

- A further feature of the invention lies in the utilization of two ofthe supporting wires as supplementary or extension lead-in wires inconjunction with leads of the usual -type sealed in the press, therebyreducing` the weight of the nlament supporting structure.

These and other features of thev invention will be best understood andappreciated' from the following description of a preferred embodimentthereof, selected for purposes of illustration and shown in theaccompanying drawing, in which:

Fig. 1 is a view in side elevation of a filament support constructedaccording to the invention,

Fig. 2 is a View in side elevation takenat right angles to Fig. l,

Fig. 3 is a view taken along the line 3 3 of Fig. l, I o

Fig. '4 is a view taken along the line t-d of Fis. 1, Y

- g. 5 is '-a plan view of the filament, and

Fig. 6 is a viewv ln cross section taken along the In Fig. 1 is shownpart of a glass lamp bulb it having a neck and a conventionalmetal baseil i threaded to nt a lamp socket. A hollow tubular are or stem l2 fusedin the neck of the bulb I0 contains an exhaust tube Il and the lowerportions of two lead wires I5 and I6. Above the end of the exhaust tubeIl the stem l2 ter- (oi. 17e-3s) vinmates in a nattened sona press u,into. which the vlead wires l5 and I6 are sealed, and a sturdycylindrical glass rod or arbor l1, integrally formed with the press I3,projects upwardly therefrom.

Midway of the hollow stem Il is placed a flat spreader disk or` anchorplate I8 of insulating refractory material, such as mica, and this isprovided with a central aperture to tit the stem I2 and, in theillustrated construction, with six pairs of eyelets 20 disposed atspaced intervals about its circumference. Two stili wires 2| and 22 arewelded or otherwise secured to the-upper ends of the lead wires I5 andI6 and lare anchore'd longitudinally in the lamp `in adjacent pairs ofeyelets 20 inthe disk i8; the wires 2i and 22 thus serve assupplementary lead wires when connected to the end of a lament 2l.

Four supporting wires 23v are also anchored. in the disk i8 by beingAhooked into .eyelets therein and project longitudinally into theinterior of Fitted over the glass arbor VI'i is a second 'per'4 foratedspreader disk .2t formed of insulating material and greater incircumference than the disk i8 but spaced well within the aring wallsvthe lamp It in spaced relation with the supplei mentary lead wires 2iand 22.

of the bulb it. Six eyelets 2t are spaced aroundl the margin ofthe disk2d for the accommodation of the wires 2i. 22, and 23 as shown in Fig. 3and two similar eyelets are placed adjacent the rod il to serve aspassages forthe leads i5. and

`the loops 28 and to the wires 23 below the ends thereof. A `coiled coililament El of tungsten wire arranged in a'. hexagonal pattern restswithin the bight of the braced loops s@ and is clamped at its ends byhooks bent in the upper ends of the supplementary lead wires 2i and 22,as shown in Fig. 5. The le and 2d support and bind the filamentsupporting wires 2t as well as the supplementary lead wires 2i and' 22with the result that the whole mount acts as a self-conf tained unitvtowithstand the shocks occurring during shipment and handling. The dangerof breaking the nare or stem of the-mountis considerably alleviated,since theillament supporting wires are anchored outside it. Moreover,this construction obviates thenecessityof using special hard glass forthe iiare or stem because substantially all the glass structure of themount is located below the insulating disk 24. It will be apparent thatthe disks and the wires form a light truss frame guided on the mount andthe glass rod and held against longitudinal movement -by the short leadin wires sealed in the i press.- In assembling the mount in the lamphowever, `its position and consequently the position of the filament inthe lamp may be adjusted accurately before spot welding the lead wiresIl and I6 to the upright supporting wires 2| and Il.

It will be understood that the truss frame of my invention is useful inany type of electric lamp but that its special ileld o'i use is in gaslled lamps in ,750, 1,000 and 1,50() watt sizes or in even larger sizes.

The details andfeatures illustrated comprise one'good practicalform 'ofthe invention, but

it'is to be understood that these may be varied in form, location andarrangement and still be within the scope of the invention as' set forthin the appended claims which deilne'what I claim as new and desire tosecure by Letters Patent of the United States.

I claim: y

l. I n an incandescent electric lamp having a bulb and a hollow stemtherein, a light sti truss frame having a pair of spreaders centered onthe mount, longitudinal members connected to the spreaders, means forcarrying the weightof the truss frame, and a filament carried by thelongitudinal members thereof.

2. In an incandescent electric lamp having a bulb and a hollow stemtherein, a light stiff truss frame having a pair of spreader diskscentered on the mount, longitudinal wires spaced by connection with saiddisks, means engaging certain of said wires to carry the weight of thetruss frame, and a. filament supported at the ends of the wires.

-3. A gas illled electric lamp of more than 1000 watt rating includingin its structure a bulb having therein a hollow stem terminating in aprojecting arbor, a light stiiI truss frame'having a disk centered von'the mount, a larger disk centered 'on the arbor and longitudinal wiresspaced and supported by said disks. wires sealed in the press andconnected to wires of the -frame for supporting the same, and a coiledtungsten :dlament supported by the wires of the truss frame. 4. In anelectric incandescent lamp including in its structure a'bulb having astern in its neck, a light stiif truss frame for supporting a filament,

said frame comprising spaced disks disposed comovement by engsin saidstem.

5. In'an'incandescent electric lamp including in its structure a bulbhaving a neck, and oontaining a tubular stem', a truss frame for sup`porting'a-iilament, said frame including a lower disk centered upon themount and spaced at its l 'periphery within the neck, an upper largerdisk v spaced at its periphery from the walls of the bulb.

-aseries of longitudinal wires anchored in-the lower disk and extendingupwardly in evenly 10 frame independently 'of said lower disk.

Y 6. A nlament support for an'incandescent elecspaced relation throughsaid upper disk, and means` for supporting the weight f the'truss triclamp which comprises a stem, an anchor plate surrounding said stem andformed of insulating material, lead wires projecting from said stem, aglass rod integral with said stem and projecting upwardly therefrom, aplurality of supporting wires fast in said anchor plate, a filament heldin position by said support wires, said leadwires being secured to twoof said support wires, and a spreader on said glass rod provided withspacedholes through which said supporting wires pass.

7. A filament support for electric incandescent lamps, which comprises astem and- 4integral press, an anchor plate disposed around said stem, aplurality of supporting wires caught in' said anchor plate, a lamentheld by said supporting wires, lead wires connected to two of saidsupporting wires, and an insulating spreader disk spaced from saidanchor plate and provided with passages for the supporting and leadwires.

8. A iilament mount for electric incandescent lamps, which comprises astem, lead wires projecting therefrom, a plurality of supporting wiresanchored outside said stem, two of said supporting wires being securedto said lead wires. wire loops secured 'to the upper(Y ends of each ofthe other support wires, bracing wires secured to said supporting wiresand to said loops, a filament supported in said loops and connected tothe iirst two supporting wires, and an insulating spreader disk providedwith passages for said supporting wires.

9. In an incandescent electric lamp having a. bulb and a base, fllamentsupporting means including a stem having a press at its inner end, leadwires projecting from said press, an arbor also projecting from saidpress, an insulating anchor disk disposed around said stem, a pluralityof supporting wires hooked in said anchor disk, a spreader disk disposedaround said arbor and provided with eyelets forming passages for saidlead and supporting wires, braced wire loops on the upper ends of saidsupporting wires, and a coiled coil filament held in said wire loops.

l0. A lfilament support which comprises a length of stiff wire having ahook at one of its ll. A filament support for electric incandescentlamps, which comprises a tubular glass stem, an

anchoring disk perforated to ilt upon said stem, a plurality ofsupporting wires secured to said anchoring disk, a spreader disk spacedfrom said anchoring diskand provided with passages for said supportingwires which are extended beyond the spreader disk and beyond the end ofthe stem, and means onthe upper ends of said supporting wires forretaining a lament.

12. An electric lamp having an internal tubular glass stem, a base, anda self-sustained iliament-supporting structure comprising a pair of iiatspacers mounted on the stem above the base and a plurality of wires'spaced symmetrically vabout the spacers and maintained in position bythem, forming an open skeleton' frame and extending beyond the same, anda illament supported by said wires beyond the end ofthe stem andconnectedinjelectrical circuit with rtwo of P. swANsoN.

- CERTIFICATE OF CORRECTION. Patent No. 2,195,572. l March 12, 19m.

KENNETH P. SWANSON. I

It is hereby certified that error, appearjs in the printed specificationof the above numbered patent requiringcor'rection as follows: Page 2,first column, lines 29 and 56, claims, 1 and 2 respectively, for theword "mount" read stem; and that the said Letters Patent shouldbereadwith this cor- 'recton therein that the same Amay confonn to the recordof the case in the Patent Office.

signed and sealed this 16th day of April, A. D. 19m.

(Seal) sle r z r. Acting Commissligner o? a ents.

